PCI: Unexport pci_walk_bus_locked()

There's only one user of pci_walk_bus_locked(), and it's internal to the
PCI core.  Unexport it and make it private to drivers/pci/.

Link: https://lore.kernel.org/r/20241022224851.340648-6-kbusch@meta.com
Signed-off-by: Keith Busch <kbusch@kernel.org>
[bhelgaas: move decl to drivers/pci/pci.h]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Author: keithbusch

drivers/pci/bus.c

@@ -435,7 +435,6 @@ void pci_walk_bus_locked(struct pci_bus *top, int (*cb)(struct pci_dev *, void *
 
 	__pci_walk_bus(top, cb, userdata);
 }
-EXPORT_SYMBOL_GPL(pci_walk_bus_locked);
 
 struct pci_bus *pci_bus_get(struct pci_bus *bus)
 {

drivers/pci/pci.h

@@ -323,6 +323,9 @@ void __pci_bus_assign_resources(const struct pci_bus *bus,
 				struct list_head *realloc_head,
 				struct list_head *fail_head);
 bool pci_bus_clip_resource(struct pci_dev *dev, int idx);
+void pci_walk_bus_locked(struct pci_bus *top,
+			 int (*cb)(struct pci_dev *, void *),
+			 void *userdata);
 
 const char *pci_resource_name(struct pci_dev *dev, unsigned int i);
 

include/linux/pci.h

@@ -1623,8 +1623,6 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max,
 
 void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
 		  void *userdata);
-void pci_walk_bus_locked(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
-			 void *userdata);
 int pci_cfg_space_size(struct pci_dev *dev);
 unsigned char pci_bus_max_busnr(struct pci_bus *bus);
 void pci_setup_bridge(struct pci_bus *bus);